How to install codecs in Windows XP:
Click Start | Control Panel and double click Add hardware, then click Next.
Click Yes, I have already connected the hardware and click Next.
Choose Add a new hardware device and click Next.
Select Install the hardware that I manually select from a list (Advanced), and click Next.
Select Sound, video and game controllers from "Common hardware types" list and click Next.
Select (Standard system devices) from "Manufacturer" and then click Have Disk.
Click Browse in the "Install From Disk" dialog box and open the folder C:\Windows\System32.
Find mmdriver.inf file, select it and click Open, then click OK in the "Install From Disk" dialog box. If you see a warning about logo compatibility, click Continue Anyway.
You can now select from the list of audio codecs. You must install them one at a time. If you know the codec you need, select it and click OK. This should re-install the codec (You may need your Windows XP installation CD). Which codec you need depends on the chat program you're using.
Restart the computer.
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